VATICAN CITY — In his first extensive piece of writing as pope, Pope Francis lays out a vision of the Catholic Church dedicated to evangelization in a positive key, with a focus on society’s poorest and most vulnerable, including the aged and unborn.

“Evangelii Gaudium” (“The Joy of the Gospel”), released by the Vatican Nov. 26, is an apostolic exhortation, one of the most authoritative categories of papal document. (Pope Francis’ first encyclical, “Lumen Fidei,” published in July, was mostly the work of his predecessor, Pope Benedict XVI.)

Read the full text of Pope Francis’ first Apostolic Exhortation, “Evangelii Gaudium.”

The pope wrote the new document in response to the October 2012 Synod of Bishops on the new evangelization, but declined to work from a draft provided by synod officials.

Pope Francis’ voice is unmistakable in the 50,000-word document’s relatively relaxed style – he writes that an “evangelizer must never look like someone who has just come back from a funeral!” – and its emphasis on some of his signature themes, including the dangers of economic globalization and “spiritual worldliness.”

The church’s message “has to concentrate on the essentials, on what is most beautiful, most grand, most appealing and at the same time most necessary,” he writes. “In this basic core, what shines forth is the beauty of the saving love of God made manifest in Jesus Christ who died and rose from the dead.”

Inspired by Jesus’ poverty and concern for the dispossessed during his earthly ministry, Pope Francis calls for a “church which is poor and for the poor.”

Pope Francis reiterates his earlier criticisms of “ideologies that defend the absolute autonomy of the marketplace and financial speculation,” which he blames for the current financial crisis and attributes to an “idolatry of money.”

He emphasizes that the church’s concern for the vulnerable extends to “unborn children, the most defenseless and innocent among us,” whose defense is “closely linked to the defense of each and every other human right.”

“A human being is always sacred and inviolable, in any situation and at every stage of development,” the pope writes, in his strongest statement to date on the subject of abortion. “Once this conviction disappears, so do solid and lasting foundations for the defense of human rights, which would always be subject to the passing whims of the powers that be.”

The pope writes that evangelization entails peacemaking, among other ways through ecumenical and interreligious dialogue. He “humbly” calls on Muslim majority countries to grant religious freedom to Christians, and enjoins Catholics to “avoid hateful generalizations” based on “disconcerting episodes of violent fundamentalism,” since “authentic Islam and the proper reading of the Quran are opposed to every form of violence.”

In words very close to those he used in an oft-quoted interview with a Jesuit journalist in August, Pope Francis writes that “pastoral ministry in a missionary style is not obsessed with the disjointed transmission of a multitude of doctrines to be insistently imposed,” lest they distract from the Gospel’s primary invitation to “respond to the God of love who saves us.”

Returning to a theme of earlier statements, the pope also warns against “spiritual worldliness, which hides behind the appearance of piety and even love for the church, (but) consists in seeking not the Lord’s glory but human glory and personal well-being,” either through embrace of a “purely subjective faith” or a “narcissistic and authoritarian elitism” that overemphasizes certain rules or a “particular Catholic style from the past.”

Despite his censures and warnings, the pope ends on a hopeful note true to his well-attested devotion to Mary, whom he invokes as the mother of evangelization and “wellspring of happiness for God’s little ones.”